Water influx isolation method

FIELD: oil and gas industry.

SUBSTANCE: water influx isolation method involves installation of process shield using the solution containing Mikrodur RU, Sulfatsell, ethylene glycol and water at water-cement ratio of 0.8-0.9. Installation of the above shield is performed in terrigenous formation which is by 5-10 m higher than oil-water contact on the basis of 0.5-2.0 m3 per 1 m of effective formation thickness at the following component ratio, wt %: Mikrodur RU 51.7-54.6, Sulfatsell 0.6, ethylene glycol 1.1, and water 43.7-46.6.

EFFECT: improving bottom water insulation, providing the reduction of water content of wells during development of oil and gas deposits.

1 tbl

 

The invention relates to the oil and gas industry and is aimed at improving the efficiency of isolation of bottom water in the development of oil and gas fields. Known way to isolate the flow of bottom water in the well, which consists in injecting into the bottom zone of aerated cement mortar, and then the product Fluorosilicone fluid (USSR author's certificate No. 939739 E21B 43/32). The disadvantage of this method of isolation of bottom water is low efficiency water shutoff, the increased complexity of the technology of injection solutions in the bottomhole formation zone (PPP).

Closest to the proposed technical solution isolate the flow of bottom water is an injection into the aquifer silicone emulsion, which consists in increasing the thickness of the natural lenticular seams by creating underneath the artificial screen with a radius equal to twice the thickness of the cutoff layer aquifer of the reservoir, providing a waterless operation of oil-water reservoir. Anhydrous well operation mode is achieved by the creation of artificial screen condensed under a lenticular seams. When determining the thickness of the screen comes from the condition that the m thick seams can withstand a differential pressure of 15 PA. After injection of insulating substances and of curing get a screen withstanding the differential pressure of 3.0 to 8.0 MPa. Then install the cement bridge or explosion-packer and perforined in the area of the subsequent selection of the fluid (RF patent No. 2015312 E21B 43/22).

This method has poor reliability of the isolation of bottom water when the process screen, since the injection of silicone emulsion to aquifer under compacted lenticular interlayer is formed screen, presents an unstable gel composition, which is in the process of developing contact her with reservoir water is destroyed, which leads to the dissolution process of the screen and infiltration of produced water in the perforation interval.

This method has the considerable consumption of chemical reagents and ineffective in the absence of the borehole compressed natural lenticular seams to create a process screen for the isolation of bottom water.

The objective of the invention is to devise effective way to reduce the water content of oil and gas wells.

The technical result of the invention is to improve the isolation of bottom water, lowering the water content of the wells in the development of oil and gas fields.

This technical result is achieved by reducing the water content of the wells by installing technology in the logical screen from a solution of microdur EN with salvatella and ethylene glycol with water-cement ratio (W/C) 0,8-0,9, which is injected into the perforation interval of 5-10 m above the contact oil-water at the rate of 0.5-2.0 m31 m of the effective thickness of terrigenous reservoir in the following ratio, wt.%.

microdur EN54,6-of 51.7
alfacell0,6-0,6
ethylene glycol1,1-1,1
water43,7 at 46.6

This method is based on the process screen to reduce the water content of oil and gas wells during their operation. Shading is achieved by injection of a solution of microdur EN with salvatella and ethylene glycol and chemical reaction between them in the process of technological education of the screen in terrigenous reservoir.

The main component of the solution is microdur EN - mineral hydraulic binder with a certain stable chemical and mineralogical composition, divided into three grades on the maximum particle size must not exceed the weight percent of d95

- X-d95<6,0 m;

- U-d95<a 9.5 m;

- F-d95<16,0 m.

Is LLC "Dyckerhoff - Sukhoy log", gahou log.

Alfacell produced according to TU 223-013-32957739-2001 CJSC polycell", Vladimir.

Ethylene glycol is produced according to GOST 10164-75 LLC Biomedium", Ufa.

The method is as follows. In the production string according to geophysical research establish the nature of neftegazonosnye and contact oil-water. 5-10 m above the contact oil-water production casing perforined. Descend into the well tubing with the packer 2 PD-YAGAMI placed 10-15 m below the perforated interval of the operational layer. Then into the well through tubing cementing pump unit estimated quantity of a solution of microdur EN with salvatella and ethylene glycol with water-cement ratio (VC) 0,8-0,9 at the rate of 0.5-2.0 m31 m of the effective thickness of terrigenous reservoir. The injection is carried out at constant control pressure injection and acceleration at the maximum injection pressure not exceeding 0,8 pressure fracturing. Then the tubing string and the packer 2 PD-YAGAMI rises to a height of 50-100 m and washed well. In the zone of injection of the solution microdur EN with salvatella and ethylene glycol establish a cement bridge and produce crimped.

For experiments testing the insulation quality of water in this way were selected samples of quartz sand, which was pre-dried in a drying Cabinet to constant weight and were compacted in the cylinder is practical container at a pressure of 250 bar, that corresponds to the effective mining of pressure for the lower Cretaceous deposits deposits of Western Siberia. The sample is saturated with formation water with a salinity of 18 g/l and was placed in kindergaten installation simulating reservoir conditions, where after the sample was filtered produced water and permeability was determined by formation water.

After determining the permeability of the sample was stored solution microdur EN with salvatella and ethylene glycol to full attenuation filter. The experience stayed for keeping the sample on responses from 19 to 20 hours, which was established experimentally in the sample solution in the surface conditions. After hardening solution to the sample were applied pressure and determined the stability of the screen to proniknoveniya produced water and the differential pressure at which technological screen retains its stability. According to the conducted experiments, the stability of the screen to the penetration of the reservoir water is 11.0 to 11.5 MPa MPa (table).

The way to isolate water production, consisting in the installation process screen, characterized in that from a solution of microdur EN with salvatella and ethylene glycol with water-cement ratio of 0.8 to 0.9 set the technology screen in terrigenous reservoir 5-10 m above the contact oil-water is at the rate of 0.5-2.0 m 31 m of the effective thickness of the reservoir in the following ratio, wt.%:

microdur EN54,6-of 51.7
alfacell0,6-0,6
ethylene glycol1,1-1,1
water43,7 at 46.6



 

Same patents:

FIELD: oil and gas production.

SUBSTANCE: sand bridging is installed before injection in the well below the defect of production string and cement bridging 5-10 m is installed above the perforation interval. The oil is injected through tubing on the basis 2 m per 1 m of the strata net thickness and water is forced out of the insulation zone. After that the solution of Mikrodur R-U with sulfatsell is pumped in with water-cement ratio 0.8-0.9 on the basis of 0.5-2.0 m per 1 m of the strata net thickness with the following component ratio, wt %: Mikrodur R-U 51.4-54.9; sulfatsell 2.3-1.1; water 46.3-44.0.

EFFECT: increase of insulation reliability in case of sealing failure of production string, reduction of insulating works period.

1 tbl

FIELD: mining.

SUBSTANCE: method of preparation for cementing of wells drilled using invert-emulsion drilling mud is characterised by the fact that casing column is lowered into the well and washed with invert-emulsion drilling mud; four flush fluids are pumped subsequently into the well: parting-displacement fluid, solvent fluid, washing fluid and displacement fluid, and their further forcing to behind-the-casing space with well cement mortar and flushing fluid with their complete displacement from the well and installation of well cement mortar in behind-the-casing space at the required interval; at that, mixture of invert-emulsion drilling mud with formation water and with organic solvent in volume ratio of (4-6):(2.5-5.5.):(0.5-1.5) respectively is used as parting-displacement flush fluid; mixture of organic solvent, tall oil and 40% of water solution of sodium hydroxide in volume ratio of (9.0-9.6):(0.2-0.5):(0.2-0.5) respectively is used as solvent flush fluid; water solution of detergent also acting as demulsifying agent with 0.5-4% mass concentration is used as washing flush fluid; light-weight cement slurry with density of 1.35-1.45 g/cm3 is used as displacement flush fluid. At that, rheological characteristics: plastic viscosity and dynamic shear stress of solvent flush fluid are higher than rheological characteristics of the previous one - parting-displacement fluid, and further washing flush fluid, and density and rheological characteristics of displacement flush fluid are higher than those of the previous one - washing flush fluid.

EFFECT: increasing the volume of dense contact of cement stone with enclosing surfaces.

4 cl, 1 ex, 3 tbl

FIELD: oil and gas industry.

SUBSTANCE: invention pertains to oil and gas industry and can be used for beds isolation in a well in the course of its casing. Device for beds isolation in a well includes hollow casing with radial hole and hollow shear pin in it, hydraulic packer, outer sleeve that forms cavity with the casing opposite its radial hole, spring-loaded element and device position switch made in a form of a sleeve with cam slot with sockets for pin connected by grooves. Cam slot has two additional sockets; operating element and cam slot code of position switch are performed with the possibility of reciprocal movement of operating element with device switching from operating position with extension of packer sealing element into position of packer disengagement from hydraulic action and then into operating position of pre-packering with extension of sealing element. Device position switch can be made in a form of a bushing with four cam slots symmetrically arranged along its generatrix, in 90, with a pin in every slot, with the possibility of switch movement with rotation in relation to all four pins according to the code of its cam slot in the course of pressure increase and fall in the device. Operating element can be performed in a form of a sleeve or plunger-valve located in the housing of valve assembly that has a channel between plunger-valve and cavity located opposite the radial hole of the casing.

EFFECT: provision of higher reliability of packering through the possibility of annular space pre-packering after main packering and packer disengagement from hydraulic action.

4 cl, 5 dwg

FIELD: oil and gas industry.

SUBSTANCE: method to insulate an absorption zone in a well includes portion preparation of plugging compositions based on acetone-formaldehyde resin and liquid glass that harden in presence of structure formers, their pumping into a well and placement in an absorption zone. During preparation of two separate portions of plugging compositions, a gel powder and a structure former for liquid glass are added into a portion from acetone-formaldehyde resin, a structure former for acetone-formaldehyde resin is added into a portion of liquid glass, and structure formers are represented by accordingly a phosphogypsum and a 15% aqueous solution of caustic soda, besides, pumping and movement of plugging composition portions in the well is carried out by two contactless flows, and mixing of flows is carried out upstream the absorption zone at the ratio of 1:1 with the following ratio of components, wt parts: the first flow: acetone-formaldehyde resin 120, gel powder 25, phosphogypsum 40, the second flow: liquid glass 105, 15% aqueous solution of caustic soda 30.

EFFECT: increased efficiency of repair insulation works under conditions of high absorption due to prevention of hydraulic insulation screen washout in process of its formation.

2 tbl

FIELD: oil and gas industry.

SUBSTANCE: method includes first discharge of excessive pressure from annular spaces down to atmospherical value, then to plug macrochannels and microchannels of fluids migration, annular and borehole spaces are filled to the upper zone of the wellhead with a sealing liquid on the basis of an aqueous solution of saponified tall oil pitch with concentration from 5 to 17%, containing 1-5% of carbon mixture having high reaction capacity by means of at least its single free topping or pumping into annular or borehole spaces under pressure, at the same time well tightness is identified in annular spaces by drop of excessive pressure down to zero values using a pressure gauge or fluid flow rate from a flow meter from annular spaces of the well.

EFFECT: liquidation of annular pressures and annular crates, prevention of gas saturation in near-surface borehole deposits, prevention of conditions for occurrence of explosions and fires at the area adjacent to the wells.

2 ex

FIELD: chemistry.

SUBSTANCE: invention relates to well construction, particularly backfill compositions used when cementing casing columns, mainly with high gas ratio. The backfill contains portland cement, oxyethylcellulose, a plasticiser, an antifoaming agent - modified organosilicon reagent POLYCEM DF, a modified vinyl acetate copolymer GASBLOCK and water. The backfill additionally contains an expansion agent - calcium oxide or calcium hydrosulphoaluminate and a setting accelerator - calcium chloride, the plasticiser is a substance the active ingredient of which is sulphonated melamine formaldehyde (CEMPLAST MF), or a product of condensation of naphthalene sulphonic acid and formaldehyde S-3, or polyether carboxylate (Melflux), with the following ratio of components, pts.wt: portland cement 95.0-99.9; modified vinyl acetate copolymer GASBLOCK 1.0-2.0; said expansion agent - up to 5.0; oxyethylcellulose 0.3-0.5; said plasticiser 0.6-0.8; calcium chloride - up to 2.0; said antifoaming agent 0.1-0.2; water 47-52. Total weight content of the dry mixture of cement and expansion agent is equal to 100 pts.wt, and total weight ratio of the modified vinyl acetate copolymer GASBLOCK and the expansion agent in the material is equal to 1:(2.5-5.0), respectively.

EFFECT: preventing migration of gas in the columned space after well cementing using the disclosed backfill.

4 cl, 2 tbl, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: in insulation method of formation water inflow in the well and lining method of bottom-hole formation zone, which involves pumping of mixture of silicon-containing substance with carbamide-formaldehyde concentrate or products on its basis, as silicon-containing substance there used is organic silicon substance or their mixture, or non-organic silicon substance at the following component ratio, wt %: silicon-containing substance 60.0-95.0, carbamide-formaldehyde concentrate or products on its basis 5.0-40.0. Method has been developed in dependent claims.

EFFECT: increasing water inflow insulation degree owing to creating high filtration resistances in porous medium and improving oil-sweeping properties of pumped compositions, and eliminating sand ingress.

6 cl, 4 tbl

FIELD: oil and gas industry.

SUBSTANCE: suspension to be used in oil and gas wells, which contains the following components: aluminium silicate source, carrying fluid, activator of the group including metal silicate, metal aluminate, alkaline activator or their combinations. At that, suspension is capable of being pumped with the composition with such rheological properties that its viscosity is 300 CP or less, and suspension can be cured in well conditions.

EFFECT: obtaining geopolymer suspensions with possibility of monitoring the thickening and hardening periods of time for wide temperature intervals and density, which are capable of being pumped and used for well cementing.

43 cl, 11 tbl, 4 ex

FIELD: process engineering.

SUBSTANCE: invention relates to oil-and-gas industry, particularly, to well cementing equipment. Proposed plane consists of units arranged mobile carriers including pump unit, process fluid receive-and-distribute unit, oil well solution preparation unit coupled with averaging unit, circulation unit, control unit, operator station, control system, piping arrangement equipped with shutoff valves and accessories. Compete set of equipment is arranged in three heated containers that allow delivery to sites by sea, rail or air, including delivery by helicopters. Container design allows mounting containers into integral unit at cementing site. Proposed plant is equipped with heat protection, ventilation, heating and illumination systems that allow access to all their components.

EFFECT: high reparability and mobility.

11 cl, 4 dwg

FIELD: oil and gas industry.

SUBSTANCE: isolation method of productive formation from bottom water inflow involves well drilling with opening of productive formation and arrangement of the working face below the level of oil-water contact (OWC), installation of casing pipes above OWC level with further cementing, cleaning of the well below casing pipes, pumping of waterproofing sealant to the cleaned well zone with isolation of bottom water and perforation of casing pipes. Well is drilled in two stages, the first one of which is performed with the main shaft to the roof of productive formation, and the second one - with pilot shaft of smaller diameter. Formation properties are investigated, and the main shaft is deepened to the level located above OWC level before casing pipes are installed. Shaft cleaning below casing pipes is performed after cementing by drilling the pilot shaft with the bit of larger diameter below OWC, and OWC zone is perforated.

EFFECT: method provides the creation of a reliable screen in OWC zone owing to avoiding the operation used for creation of sand-clay plug and cleaning of the well shaft in OWC zone after it is drilled and reinforced with casing pipes, creation of reliable waterproofing screen due to OWC zone perforation, reduction of costs for waterproofing sealant, which is due to the fact that it is pumped directly to OWC zone after perforation.

4 dwg

FIELD: oil and gas industry.

SUBSTANCE: compound-action composition for treatment of bottom-hole zone of gas well contains 70% of methanol water solution and mixture of surface active substances - SAS: non-ionic - OP-10 and anionic sulphanole at their ratio of 4:1 respectively, where the quantity of the above mixture is chosen as per the specified formula.

EFFECT: creation of compound-action composition for treatment of bottom-hole zone of gas well, which prevents foaming of pumped medium at its being supplied to bottom hole and hydrating along the shaft of gas well and in ground equipment when the liquid is carried over to surface and providing high efficiency for removing high-mineralised waters in presence of gas and gas condensate from bottom holes of low temperature gas wells.

1 tbl

FIELD: oil and gas industry.

SUBSTANCE: well treatment liquids include water, at least one hydratable polymer, granules of sodium percarbonate with the coating retarding its liberation. As per the first version, the above coating is non-organic material. As per the second version, the above coating includes mixture of styrene-acrylate and butyl acrylate. Underground formation hydraulic fracturing method involves granules of sodium percarbonate with coating from non-organic material retarding its liberation. Inventions have been developed in dependent claims.

EFFECT: avoiding premature viscosity reduction of treatment liquid due to using sodium percarbonate granules with the coating retarding its liberation.

23 cl, 4 tbl, 6 ex, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: well treatment liquids include water, at least one hydratable polymer, granules of sodium percarbonate with the coating retarding its liberation. As per the first version, the above coating is non-organic material. As per the second version, the above coating includes mixture of styrene-acrylate and butyl acrylate. Underground formation hydraulic fracturing method involves granules of sodium percarbonate with coating from non-organic material retarding its liberation. Inventions have been developed in dependent claims.

EFFECT: avoiding premature viscosity reduction of treatment liquid due to using sodium percarbonate granules with the coating retarding its liberation.

23 cl, 4 tbl, 6 ex, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: well treatment liquids include water, at least one hydratable polymer, granules of sodium percarbonate with the coating retarding its liberation. As per the first version, the above coating is non-organic material. As per the second version, the above coating includes mixture of styrene-acrylate and butyl acrylate. Underground formation hydraulic fracturing method involves granules of sodium percarbonate with coating from non-organic material retarding its liberation. Inventions have been developed in dependent claims.

EFFECT: avoiding premature viscosity reduction of treatment liquid due to using sodium percarbonate granules with the coating retarding its liberation.

23 cl, 4 tbl, 6 ex, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: well treatment liquids include water, at least one hydratable polymer, granules of sodium percarbonate with the coating retarding its liberation. As per the first version, the above coating is non-organic material. As per the second version, the above coating includes mixture of styrene-acrylate and butyl acrylate. Underground formation hydraulic fracturing method involves granules of sodium percarbonate with coating from non-organic material retarding its liberation. Inventions have been developed in dependent claims.

EFFECT: avoiding premature viscosity reduction of treatment liquid due to using sodium percarbonate granules with the coating retarding its liberation.

23 cl, 4 tbl, 6 ex, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: well treatment liquids include water, at least one hydratable polymer, granules of sodium percarbonate with the coating retarding its liberation. As per the first version, the above coating is non-organic material. As per the second version, the above coating includes mixture of styrene-acrylate and butyl acrylate. Underground formation hydraulic fracturing method involves granules of sodium percarbonate with coating from non-organic material retarding its liberation. Inventions have been developed in dependent claims.

EFFECT: avoiding premature viscosity reduction of treatment liquid due to using sodium percarbonate granules with the coating retarding its liberation.

23 cl, 4 tbl, 6 ex, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: well treatment liquids include water, at least one hydratable polymer, granules of sodium percarbonate with the coating retarding its liberation. As per the first version, the above coating is non-organic material. As per the second version, the above coating includes mixture of styrene-acrylate and butyl acrylate. Underground formation hydraulic fracturing method involves granules of sodium percarbonate with coating from non-organic material retarding its liberation. Inventions have been developed in dependent claims.

EFFECT: avoiding premature viscosity reduction of treatment liquid due to using sodium percarbonate granules with the coating retarding its liberation.

23 cl, 4 tbl, 6 ex, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: solid foaming agent for removal of liquid from bottom hole, which is obtained using ammonium carbonate and surface active substances - non-ionic- OP-10 or OP-7 and anionic - sulphanole by formation of mixture and its solidification, where at ratio of OP-10 or OP-7 and sulphanole of 3.3-5.2:1.0 the mixture also contains Kolamid K; at that, mixture is prepared by mixing of OP-10 or OP-7, sulphanole and Kolamid K, by heating of the obtained mixture of up to 40-60C, by its mixing till sulphanole is diluted, and then, by adding ammonium carbonate, at the following component ratio, wt %: OP-10 or OP-7 33.0-52.0, sulphanole 10, ammonium carbonate 0.2-0.5, and Kolamid K is the rest.

EFFECT: improving foaming efficiency and carry-over of high-mineralised waters in presence of gas condensate from bottom holes of low temperature gas and gas-condensate wells, and improving the manufacturability of solid bars - sticks.

3 tbl, 3 ex

FIELD: oil and gas industry.

SUBSTANCE: solid foaming agent for removal of liquid from bottom hole, which is obtained using ammonium carbonate and surface active substances - non-ionic- OP-10 or OP-7 and anionic - sulphanole by formation of mixture and its solidification, where at ratio of OP-10 or OP-7 and sulphanole of 3.3-5.2:1.0 the mixture also contains Kolamid K; at that, mixture is prepared by mixing of OP-10 or OP-7, sulphanole and Kolamid K, by heating of the obtained mixture of up to 40-60C, by its mixing till sulphanole is diluted, and then, by adding ammonium carbonate, at the following component ratio, wt %: OP-10 or OP-7 33.0-52.0, sulphanole 10, ammonium carbonate 0.2-0.5, and Kolamid K is the rest.

EFFECT: improving foaming efficiency and carry-over of high-mineralised waters in presence of gas condensate from bottom holes of low temperature gas and gas-condensate wells, and improving the manufacturability of solid bars - sticks.

3 tbl, 3 ex

FIELD: oil and gas industry.

SUBSTANCE: treatment reagent for process liquids used during drilling and overhaul of wells involves mixture of 8-oxyquinoline and amidosulphonic acid at molar ratio of 1:1 respectively.

EFFECT: improving inhibiting properties of process liquids used during drilling and overhaul of wells; enlarging the range of clay inhibitors.

3 tbl, 20 ex

FIELD: production and exploratory well drilling, particularly foaming drilling fluids used during penetration through incompetent rock intervals and during primary productive oil and gas deposit opening in the case of abnormally low formation pressure.

SUBSTANCE: foam composition comprises surfactant, foam stabilizer, water, water hardness control additive and lubricant. The water hardness control additive is sodium silicate. The lubricant is VNIINP-117 emulsion. The foam stabilizer is polyacrylamide, the surfactant is sulphonole. All above components are taken in the following amounts (% by weight): sulphonole - 0.8-1.5, sodium silicate - 0.2-0.5, polyacrylamide - 0.1-0.5, VNIINP-117 - 0.5-2, remainder is water.

EFFECT: reduced power inputs for well drilling, as well as reduced coefficient of friction between drilling tool and well wall.

1 tbl

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